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Evaluation method and device for fault sealing performance of gas storage, electronic equipment and medium

An evaluation method and technology of gas storage, applied in the field of oil and gas exploration, can solve the problems of tightness being affected by fault structural factors, difficult to demonstrate, lack of systematic evaluation of fault tightness, etc., and achieve the effect of scientific fault tightness and scientific characterization

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, my country's gas storage construction needs are mostly located in the depleted sandstone gas reservoirs in the eastern region with complex structures, and its sealing is affected by fault structure factors, so it is difficult to demonstrate
In China, there are many methods for evaluating fault sealing of gas reservoirs or gas storages, but these methods rely on fault mudstone smear analysis or focus on tectonic stress analysis methods, and lack faults that take into account factors such as lithology, petrophysical properties, and fracture development degree. Sealing System Evaluation

Method used

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  • Evaluation method and device for fault sealing performance of gas storage, electronic equipment and medium
  • Evaluation method and device for fault sealing performance of gas storage, electronic equipment and medium
  • Evaluation method and device for fault sealing performance of gas storage, electronic equipment and medium

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Embodiment 1

[0109] Attached below figure 2 A method for evaluating the fault tightness of a sandstone gas reservoir-type gas storage according to an embodiment of the present invention is described. like figure 2 shown,

[0110] First, obtain the data of the underground target reservoir section in the target area of ​​the gas storage site, including seismic data, logging data, structural horizon and fault data, and petrophysical experimental analysis data.

[0111] Next, the lithologic characterization of the gas storage is obtained through lithologic inversion, and the mudstone smear coefficient T is calculated on this basis.

[0112] Through the prediction of rock formation breakthrough pressure, the breakthrough pressure P of the fault zone is calculated; through the fracture seismic prediction, the fracture density F of the fault zone is calculated.

[0113] According to the smear coefficient T, breakthrough pressure P and crack density F, calculate the comprehensive evaluation i...

Embodiment 2

[0117] Attached below Figure 3-11 An application example of the method for evaluating the fault tightness of a sandstone gas reservoir type gas storage of the present invention is described.

[0118] A depleted sandstone gas reservoir in eastern my country was selected to carry out evaluation research on fault sealing of reconstructed gas storage. The top of the target interval of the gas reservoir is a small anticline, which is developed between two normal faults in the north and south, and is cut by a small fault in the middle. The structural high point is near the center of the trap (see image 3 ). Trap gas-bearing area of ​​0.5km 2 , the reservoir is mainly developed in the S2-S5 sand group, the distribution is stable and the thickness is large, the gas layer has good lateral connectivity, and the reservoir physical properties are good. The S1 sand group is mudstone. The overlying stratum of the reservoir is a 300m thick regional mudstone caprock. The gas reservoir ...

Embodiment 3

[0125] The present disclosure also provides an evaluation device for fault tightness of a sandstone gas reservoir-type gas storage, including:

[0126] Lithology characterization module: used for gas storage lithology characterization;

[0127] Smear analysis module: used for fault mudstone smear analysis;

[0128] Pressure analysis module: used for breakout pressure analysis of fault zone;

[0129] Fracture density prediction module: used for fracture density prediction in fault zone;

[0130] Comprehensive evaluation module: Based on smear analysis results, breakthrough pressure analysis results and crack density prediction results, comprehensive evaluation of fault tightness is carried out.

[0131]Specifically, the lithology characterization module, the smear analysis module, the pressure analysis module, and the fracture density prediction module are respectively connected in communication with the comprehensive evaluation module, and send the results to the comprehensi...

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Abstract

The invention discloses an evaluation method and device for fault sealing performance of a gas storage, electronic equipment and a medium. The evaluation method comprises the following steps: representing lithology of the gas storage; fault mudstone smearing analysis; analyzing breakthrough pressure of the fault zone; predicting the fracture density of the fault zone; and based on the smearing analysis result, the breakthrough pressure analysis result and the fracture density prediction result, fault sealing performance comprehensive evaluation is carried out. According to the method for evaluating the fault sealing performance of the sandstone gas reservoir type gas storage, the characteristic that the fault sealing performance is influenced by factors such as mudstone smearing, stratum rock physical characteristics and associated fracture development is considered, and the fault sealing performance is evaluated on the basis of calculation of parameters such as fault mudstone smearing, fault zone breakthrough pressure and fault zone fracture development density. And comprehensively and quantitatively evaluating the fault sealing performance by constructing a fault sealing performance comprehensive evaluation index. According to the method, the sealing performance of the sandstone gas reservoir type gas storage fault is evaluated more comprehensively, scientifically and effectively, so that the design of a gas storage construction scheme is supported.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, and relates to underground gas storage evaluation technology, in particular to an evaluation method, evaluation device, electronic equipment and storage medium for fault sealing of sandstone gas reservoir type gas storage. Background technique [0002] The underground gas storage is a kind of artificial gas reservoir formed by reinjecting natural gas into the underground space. It has the characteristics of large storage capacity, wide range of peak regulation, economical and reasonable, and durable. Underground gas storage is one of the important links in the natural gas industry chain, and has become a strategic infrastructure to ensure safe and stable gas supply. The construction of foreign gas storage has a history of hundreds of years. For example, there are more than 400 gas storages in operation in the United States, and the working gas volume accounts for 18% of its gas co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06F30/20G06Q50/02
CPCG06Q10/06393G06F30/20G06Q50/02
Inventor 曾大乾贾跃玮张广权王丹丹张俊法
Owner CHINA PETROLEUM & CHEM CORP